Mechanical characteristics of single cracked limestone in compression-shear fracture under hydro-mechanical coupling

Liu, Qiang; Zhao, Yanlin; Tang, Liming; Liao, Jian; Wang, Xiaguang; Tan, Tao; Chang, Le; Luo, Shilin; Wang, Min

doi:10.1016/j.tafmec.2022.103371

Cited by 43 publications

(9 citation statements)

References 47 publications

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“…The constant resistance deformation process of the anchor rod with constant resistance absorbs energy, which improves the force condition of the anchor rod under load and effectively improves the mechanical properties of the anchor rod. The constant resistance deformation stage of the anchor absorbs the deformation energy of the surrounding rock directly and also provides a certain distance for the deformation of the surrounding rock, which indirectly consumes part of the deformation energy of the surrounding rock, thus also improves the impact resistance of the support system of “support—surrounding rock” [ 32 , 33 ]. The effect of constant resistance energy-absorbing anchors and energy-absorbing brackets is better when used together.…”

Section: Design Of Constant-resistance Energy-absorbing Anti-scour An...mentioning

confidence: 99%

Numerical Analysis of Mechanical Characteristics of Constant-Resistance, Energy-Absorbing and Anti-Scour Bolts

Tang

Liu

et al. 2022

Materials

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In order to improve the impact resistance mechanical properties of bolt, the requirements of rock burst roadway support must be met. Based on the requirements that the anchor should have a reasonable deformation load threshold, high stroke efficiency, constant reaction force and stable repeatable deformation damage mode. A constant resistance anti-impact device was designed, and a new constant resistance energy-absorbing impact anchor rod was designed in combination with a conventional anchor rod, and the working principle of a constant resistance energy-absorbing impact anchor rod was given. ABAQUS finite element software was used to analyze the mechanical properties of bolt and the results showed that the constant resistance energy-absorbing anti-shock anchor has a stable and repeatable deformation damage mode under both static and impact loads, and the three indexes of the constant resistance energy-absorbing anti-shock anchor, such as yield distance, impact resistance time and energy absorption, are significantly better than those of the conventional anchor. The impact energy and impact velocity have less influence on the load-bearing capacity and stroke efficiency of the impact device. The impact velocity has less influence on the indices of the rod yield load, breaking load, absorbed energy and the yield distance of a conventional anchor and constant resistance energy-absorbing anti-stroke anchor, and the impact resistance time decreases non-linearly with the increase in the impact velocity.

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Section: Design Of Constant-resistance Energy-absorbing Anti-scour An...mentioning

confidence: 99%

Numerical Analysis of Mechanical Characteristics of Constant-Resistance, Energy-Absorbing and Anti-Scour Bolts

Tang

Liu

et al. 2022

Materials

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“…Experiments show that coal permeability and strain have a certain relationship [38][39][40][41][42]. The combined effects of volume deformation and adsorption deformation should be considered when developing the stress-strain-permeability model [43][44][45][46], where volume deformation can be measured by experimental methods and adsorption expansion deformation is obtained through the fractal Langmuir model of coal heterogeneity. The following assumptions are introduced to avoid complicated theoretical derivation:…”

Section: Model Establishment and Derivationmentioning

confidence: 99%

Coupled Seepage Mechanics Model of Coal Containing Methane Based on Pore Structure Fractal Features

Zhu

et al. 2022

Fractal Fract

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The paper applies fractal theory to the structure of fractal coal pores and calculates the fractal dimension and integrated fractal dimension for each pore section >100 nm, 100 nm > d > 5.25 nm, and <2 nm. In the experiment, we performed the full stress–strain-seepage experiment of methane-bearing coal, revealed the deformation–seepage characteristics of methane-bearing coal under load, and deduced the dynamic prediction mechanical model of methane-bearing coal permeability based on pore heterogeneity, followed by practical verification. The results show that the permeability change in methane-bearing coal is an external manifestation of coal pore deformation, and the two are closely related and affected by changes in the effective stress coefficient. The derived fractal-deformation-coupled methane permeability mechanics model based on coal pore heterogeneity has high accuracy, a general expression for the stress–strain-permeability model based on coal heterogeneity is given, and the fractal Langmuir model is verified to be highly accurate (>0.9) and can be used for coal reservoir permeability prediction.

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“…Under such conditions, the frost heaving force in the saturated pores caused by water/ice phase transition can cause cracks and defects, further leading to the destruction of rock engineering in cold regions (Kock et al, 2015;Park et al, 2015;Tan et al, 2018;Kong et al, 2020). Zhao et al studied the creep failure mechanism of rock cracks under hydraulic pressure and derived the compression-shear fracture criterion of rock under hydromechanical coupling (Liu et al, 2022;Zhao et al, 2019). Therefore, to develop an early warning model of rock engineering failure is of great significance for engineering safety evaluation.…”

Section: Introductionmentioning

confidence: 99%

Study on critical slowdown characteristics and early warning model of damage evolution of sandstone under freeze–thaw cycles

et al. 2023

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Freeze–thaw damage of rock mass poses a great threat to the safety of rock engineering, ground buildings, and low-temperature storage of liquefied natural gas (LNG) in cold regions. By collecting acoustic emission (AE) signals of sandstone during uniaxial compression failures, this paper analyzed the critical slowdown phenomenon of different types of sandstone during the freeze–thaw failure. According to the auto-correlation coefficients and the variance of AE signals under different windows and steps, the precursors were determined and a warning model of rock engineering failure precursors based on the critical slowdown principle was proposed. Then the Grey Wolf Optimizer (GWO) algorithm was used to optimize the initial weights and thresholds of the back propagation (BP) neural network, and the influence factors of rock engineering failure under different working conditions were input as training sets to train the network. The results showed that the correlation coefficients between the predicted value and real value of the GWO-BP neural network reached 99.90% and 98.81% respectively, indicating that the accuracy of the BP neural network prediction was improved. This study provides a new method for rock engineering failure early warning, and has great theoretical and guiding significance for enriching and improving the rock mass AE monitoring technology.

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Mechanical characteristics of single cracked limestone in compression-shear fracture under hydro-mechanical coupling

Cited by 43 publications

References 47 publications

Numerical Analysis of Mechanical Characteristics of Constant-Resistance, Energy-Absorbing and Anti-Scour Bolts

Numerical Analysis of Mechanical Characteristics of Constant-Resistance, Energy-Absorbing and Anti-Scour Bolts

Coupled Seepage Mechanics Model of Coal Containing Methane Based on Pore Structure Fractal Features

Study on critical slowdown characteristics and early warning model of damage evolution of sandstone under freeze–thaw cycles

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